1.6d shudder after cold start, goes away - page 2 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• #15 by 745 turbogreasel on 07 Nov, 2013 15:54
• Correct, that is the only one that is not under  significant pressure in normal operation, so is least likely to leak to the outside. 
  
  sounds like it's time to double check every hose clamp, and any rubber line for  age cracking.